Oil-well pump



April 6 1926.

1,579,134 J. O. PEARSON OIL WE'LL PUMP 7 Filed Jan. 21. 1925 2 Sheets-Sheet 1 April 6 1926. 1,579,734

J. O. PEARSON OIL WELL PUMP Filed Jan. 21. 1925 2 Sheets-Sheet 2 y z'ra'i'a? 23 mo /6 I i 17- s 1 /a A I l gwumtoz J0 flrz/va/i.

Patented Apr. 6, 1926.

UNITED STATES rarsur OFFHCE.

JOHN O. PEARSON, OF SMACKOVER, ARKANSAS.

OIL-"W ELL PUMP.

Application filed January 21,1925. Serial No. 3,809- j The present invention appertains to oil well pumps and aims to improve uponthe structure of the working valve, so that the plunger will operate in lubricating oil, and so that the crude oil being pumped will not come into direct contact therewith. It is quite: common in oil well pumping to en counter some troubles, which destroy the cups of the plunger in the ordinary working barrel. In practice, it is common ior these cups to be destroyed by being cut with sand in an hour and a half, and this causes three or four hours to be consumed in pulling out sucker rods and changingthe cups. My improved structure obviates all of thesenuisauces and furthermore operates more elli-r ciently than the structures now commonly in use.

It is avery important Qb ect of the invention to provide an improved structure of this nature which is extremely simple and eliicient, one which is thoroughly reliable in operation, strong, durable, and not liable to readily get out'o't' order, comparatively inexpensive to construct, and otherwise well adapted to the purpose torwhich it isdesigned.

\Vith the above and numerous other objects in view, as will appear as the description proceeds, the invention resides in certain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the drawing:

Figure 1 is an elevation of my improved structure, 7

Figure 2 is another elevation therof, taken at right angles to that shown in Figure 1,

Figure 3 is a detail longitudinal section through the working barrel, I

Figure 4 is a detail view, partly in section, showing the arrangement of the valves in the well tubing,

Figures 5 and 6 are transverse sections, taken substantially on the lines 55 and 66 respectively of Figure 1.

Referring to the drawing in detail, it will jtom of the well.

' be seen that 1 designates the outside shell,

in which extends the working barrel 2. The

shell and barrel 2 may be formed in any suitable number of sections and in the present embodiment of the invention, a tube 3 communicates with the bottom of the shell '1,as at 4, and depends therefrom tothe bot- A counter-bore 6 is threaded into the lower end of the shell 1 and onto the lower end of the working barrel 2, depending therefrom for the reception of the polish rod '7. A compartment 8 is formed in thiscounter bore by means oi annular shoulders 9 and 10, and suitable packing 11 is held against the shoulder10,

about the polish rod 7, by a spring 12., A cylinder 13 is threaded on the bottom end of the counter bore 6 as at 1st, and the polish rod 7 extends therein and has supported on its reduced end a plurality of plunger-s 16 having the leather cups 17 associated therewith in the well known manner. At

a point below the cylinder 13, the tube 0 is provided with a pair of spaced check valves '19 and 20, which in the present in stance are shown as balls, seatable upon seats 21 in cages 22. These-cages 22 are spaced from each other and a pipe'section 23 is communicated with the tube between the cages, as is clearly shown in Figure 4, This pipe section includes the longer branch 24:, which is curved at its outer end and merges into the upwardly extending shorter arm or branch 25, the end of which is communicated withthe tube, between the two valves.

Theupper end of the branch 24 of the pipe section 23 communicates with the cylinder adjacent the top thereof shown clearly in Figure 3. A plug 26 is provided at the bottom of the cylinder 13, while adjacent the upper end of the pipe 24 there is provided a plug 27.

From the above detailed description, an

understanding of the invention may be appreeiated in its operation. lhe plungers 16 are first disposed at the lower end of the cylinder, and the plug 27 is removed in order that the pipe sections 24: and 25 and the cylinder 13 may be filled witha good grade of lubricating oil. The plug 27 is then put in place, and theappa ratus is ready for operation. hen the polish rod 7 is moved upward with the plungers, the lubricating oil is forced from the cylinder 13 through the pipe sections 2d and .45, lifting the valve 19. As the plungers are lowered, the columns of lubricating oil will be lifted through the pipe section 241 by vacuum formed in the bottom of barrel 18, thereby lifting valve 20, which causes the crude oil from the well to be lifted through the tube 3, and partially collect in the arm 25 of the pipe section 23. The crude oil being heavier than the lubricating oil will not mix therewith, so that when the plunger again moves upwardly, this crude oil with its sand will be forced through the upper valve 19. Thus it will be seen that the plungers 16 are operating at all times, in a high class of lubricating oil, and that the crude oil with the mixture of the sand therein, will not engage the leather cups 17 so as to cause the destruction thereof. It will be apparent from the above that I have provided a pumping structure which will operate efiiciently and free from contact with the sand suspended in the crude oil in the well, so that the cups of the plunger will last for a considerable greater length of time than in the conventional pumping struc tures now in use. The device is not liable to readily get out of order and needs prac tically no attention during its operation. It will also be apparent that the present embodiment of the invention obtains all of the features of advantage enumerated in the statement of the invention and the above description and that numerous changes in the details of construction and the combination and arrangement of parts may be resorted to, without departing from the spirit or scope of the invention as hereinafter claimed, or sacrificing any of its advantages.

Having thus described my invent-ion, what I claim as new is:

1. In a structure of the class described, a shell, a cylinder at the bottom of the shell, a plunger in the cylinder, a tube extending downwardly from the bottom of the shell, a pair of spaced check valves in the tube, and a pipe section connecting the cylinder with the tube between the check valves.

2. In a structure of the class described, a shell, a working barrel in the shell, a cylinder at the bottom of the working barrel, a plunger in the cylinder, a tube extending downwardly from the bottom of the shell, a pair of spaced check valves in the tube, a pipe section connecting the cylinder with the tube between the check valves, said pipe section consisting of a substantially U- shaped formation including a relatively long arm connected to the cylinder and a relatively short armconnected to the tube.

3. In a structure of the class described, a shell, a working barrel in the shell, a polish rod slidable in the working barrel, a packing tube depended from the bottom end of the shell, a packing in the tube surrounding the polish rod projected therethrough, a cylinder depending from the tube, a plunger in the cylinder and attached to the polish rod, a conduit depending from the bottom or" the shell, a pair of spaced check valves in the conduit, and a pipe section connected to the cylinder and to the conduit between the check valves.

l. In a structure of the class described, a shell, a working barrel in the shell, a polish rod slidable in the working barrel, a packing tube depended from the bottom end of the shell, a packing in the tube surrounding the polish rod projected therethrough, a cylinder depending from the tube, a plunger in the cylinder and attached to the polish rod, a conduit depending from the bottom of the shell, apair of spaced check valves in the conduit, a pipe section connected to the cylinder and to the conduit between the check valves, the bottom end of the cylinder being opened, and a removable plug inserted in the opening of the cylinder, in order that it and the pipe section may be iilled with lubricating oil.

In testimony whereof I aflix my signature.

JOHN O. PEARSON. 

